The modest radio structures of 90 % of the quasar
population (the radio-quiet quasars) can be contrasted with
the expansive double-lobed structures powered by jets seen
in the remaining ~ 10 %, the radio-loud quasars. This
has led some to suggest that the radio emission in radio
quiet-quasars has a fundamentally different origin. We
present the first direct evidence for relativistic motion in
a parsec-scale radio-quiet quasar jet, based on VLBA
multi-epoch phase referenced observations of the quasar
1407+263. The three epochs observed to date show an
increasing separation of the knots in the milliarcsecond jet
of this object, which given its redshift, corresponds to
apparent superluminal motion. This result strongly points
towards a fundamental similarity in the jet-producing
mechanisms of radio-quiet quasars and those in radio-loud
quasars.